1Drop your JPG images into the box above, or pick them from your device — there is nothing to install and no account to create.
2Choose how hard to squeeze: a quality or bitrate target, and optionally smaller dimensions if size matters more to you than detail.
3Start the job and let the workers re-pack the file; your original is never modified in place.
4Compare the new size against the original, then download the compressed JPG file.
Compress JPG FAQ
How does Compress JPG actually make the file smaller?
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Concretely, the encoder re-runs the DCT quantiser at the quality factor you choose, so the saving comes from coarser coefficients rather than from fewer pixels — the dimensions of the picture never change, and quality 80 is the usual sweet spot. Nothing about it depends on you installing software: the job runs server-side and hands back a finished file.
How much smaller will my file get?
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That is decided by the content, not by the tool. Photographic detail, film grain and sensor noise resist compression; flat colour, large uniform areas, line art and text collapse. Expect a dramatic reduction on a screenshot or a logo and a modest one on a busy photograph.
Does the format of my file change how much I can save?
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Very much so. JPG stores 8-bit RGB through a lossy DCT with 4:2:0 chroma subsampling by default, so fine red text and hard edges are the first things to soften. That determines both the headroom available and whether the saving costs you anything in fidelity.
Is there anything specific to JPG I should know before compressing?
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Yes — every save re-runs the quantiser, so repeatedly editing and resaving a JPG compounds generation loss even if you never lower the quality slider. It is worth knowing before you overwrite an original you might need again.
What is the most common mistake when compressing JPG images?
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Compressing the same file repeatedly. Each pass on a lossy format is a fresh generation of loss and the savings shrink while the damage accumulates. Go from the original to your target in one step, and keep the original.
What do I get back, and can I control the trade-off?
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A single compressed file per input, at a quality level you choose rather than a fixed default. If the result is still not small enough, reducing the pixel dimensions will do more for it than pushing the quality slider further down.
What can I upload to Compress JPG?
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Anything in the lossy raster family — JPG, JPEG, JFIF and WebP — plus the lossless formats (PNG, BMP, TIFF) if you want to mix them in one batch. The format is read from the file header, not the extension, so a photo saved with the wrong suffix still goes through.
Is there a file size limit on Compress JPG?
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Yes: free accounts process images up to 25 MB each, which covers essentially every camera JPG and phone photo; the work is done by libjpeg-turbo and libwebp, the same libraries a desktop editor links against. Larger files are the one thing the free tier will stop you on, and the limit is per file rather than per batch.
Will Compress JPG lower the quality of my JPG images?
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A lossy source is already the result of one quantisation pass, and any operation that has to re-encode adds a second. Where the job can be done without touching the pixel data we do that instead, and where it cannot you choose the quality factor yourself rather than getting a fixed default.
Can I run Compress JPG on several JPG images at once?
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Yes. Drop the whole set into the upload area and they queue in parallel with identical settings — that is the main reason to do this in a browser rather than one file at a time in an editor. Free accounts run one file per batch; a pass lifts that.
What happens to EXIF and colour profile data?
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Camera EXIF (ISO, shutter, lens, GPS) and the embedded ICC profile are carried across by default, because dropping the profile is what makes colours shift on re-import. Use the privacy option to strip metadata before download if you are about to publish the file.
Does Compress JPG cost anything?
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No. Compress JPG is free with no account, no watermark on the output and no signup wall in front of the download. Uploads are deleted automatically a short time after the job finishes.
